碱溶性三元无规共聚物的表面活性

碱溶性三元无规共聚物的表面活性;碱溶性共聚物;表面张力     

聚醚醚酮链段连接方式与其性能关系的研究

利用亲核取代反应,通过缩聚法合成了一种新型聚芳醚酮50％交替共聚物PEDEK-PETMDEK,通过¹HNMR证明其具有预期的结构.通过考察50％无规共聚物、50％交替共聚物、均聚物PEDEK和PET-MDEK的溶解性和热性能,发现聚醚醚酮共聚物的链段连接方式对聚合物性能有很大影响.50％交替共聚物是一种无定形固体,易溶于通常的有机溶剂,而50％无规共聚物却是半结晶聚合物,除浓硫酸外几乎不溶于任何溶剂;50％交替共聚物具有比50％无规共聚物更高的玻璃化转变温度.     

聚丙烯-g-聚氨酯共聚物组成对其结晶行为的影响

接枝共聚物;聚丙烯-g-聚氨酯共聚物组成对其结晶行为的影响     

氯化原位接枝制备CPE-g-MMA接枝共聚物

氯化原位接枝制备CPE-g-MMA接枝共聚物;接枝共聚物结构;氯化原位接枝;力学性能     

三苯胺-螺硅芴共聚物的合成

三苯胺-螺硅芴共聚物的合成;螺硅芴;三苯胺;共聚物;合成     

丙磺舒药物键合两亲共聚物的制备

丙磺舒药物键合两亲共聚物的制备;丙磺舒; 两亲共聚物; 高分子药物     

含羧基/环氧树脂的丙烯酸酯共聚物乳液的制备和交联——1.含羧基丙烯酸酯共聚物乳液的分子设计和制备

以在低温下(<100℃)实现含羧基/环氧树脂的丙烯酸酯共聚物乳液的交联固化为目的,进行了分子设计;估算了共聚物的组成,用碱滴定法测定了乳胶粒表面的羧基数,并比较了不同单体配比所得乳液的成膜性能.     

聚甲基丙烯酸酯改性聚氨酯光固化水性体系研究

水性涂料;聚甲基丙烯酸酯改性聚氨酯光固化水性体系研究;接枝共聚物;聚氨酯丙烯酸酯;丙烯酸酯共聚物     

乙酰丙酮钛螯合物掺杂丙烯酸酯共聚物水溶胶

乙酰丙酮钛螯合物掺杂丙烯酸酯共聚物水溶胶;乙酰丙酮钛螯合物; 丙烯酸酯共聚物水溶胶;掺杂     

双甲基丙烯酰氧苯基丙烷与苯乙烯共聚物的光学性能

标题共聚物的耐冲击性与丙烯酸酯均聚物相比有明显改善,但随着双烯单体含量的降低,共聚物的耐热性和表面硬度有所下降。丙烯酸酯含量为70%的共聚物的吸收紫外光能力最强(<370nm全吸收),含量为5%～10%的共聚物耐吸水性、耐酸耐碱性及耐冲击性最好。     

AB型两亲聚L-谷氨酸-苄酯-聚乙二醇嵌段共聚物的合成与表征

利用L 谷氨酸和苯甲醇反应制备了L 谷氨酸 苄酯 ,然后将其与三聚光气反应制备了N 羧基 L 谷氨酸 环内酸酐 (NCA) .以聚乙二醇单甲醚 (MPEG)为原料 ,制备了端氨基聚乙二醇单甲醚 (MPEG NH2 ) ,并以此作为引发剂 ,引发NCA开环聚合 ,合成了不同分子量的聚L 谷氨酸 苄酯 聚乙二醇单甲醚 (PBGM )嵌段共聚物 .利用IR、1 H NMR、DSC、GPC等方法对共聚物结构进行了表征 .结果表明 ,MPEG NH2 引发NCA开环聚合得到的是嵌段共聚物 ,通过1 H NMR谱得到共聚物组成及数均分子量 ;随着共聚物中MPEG含量的增高 ,聚L 谷氨酸 苄酯的亲水性有所改善     

Y-shaped block copolymers of poly(ethylene glycol) and poly(N-isopropylacrylamide) synthesized by ATRP

Novel Y-shaped block copolymers of poly(ethylene glycol) and poly(N-isopropylacrylamide),PEG-b-(PNIPAM)_2,were successfully synthesized through atom transfer radical polymerization(ATRP).A difunctional macroinitiator was prepared by esterification of 2,2-dichloroacetyl chloride with poly(ethylene glycol) monomethyl ether(PEG).The copolymers were obtained via the ATRP of N-isopropylacrylamide(NIPAM) at 30℃with CuCl/Me_6TREN as a catalyst system and DMF/H_2O(v/v = 3:1) mixture as solvent.The resulting copo...     

Characterization of amphiphilic hydrocarbon modified Poly(ethylene glycol) synthesized through ring-opening reaction of 2-(1-octadecenyl)succinic anhydride

Poly(ethylene glycol) (PEG) triblock and diblock amphiphilic block copolymers were synthesized from poly(ethylene glycol) and poly(ethylene glycol) monomethyl ether, respectively. The hydroxyl groups of PEG readily react with 2-(1-octadecenyl) succinic anhydride (OSA) at 140 °C through ring-opening reaction of the succinic anhydride. Both the PEG-OSA diblock and triblock copolymers are produced without use of any solvent or catalyst. The molecular structure of the copolymers was characterized by ¹H NMR and FTIR spectroscopy, and the thermal properties by DSC. The behavior of the copolymers in selective and nonselective solvents was studied by ¹H NMR spectroscopy in deuterium oxide and d-chloroform. The aggregation of the polymers in water was studied with a particle size analyzer and a transmission electron microscope (TEM) in bright field mode. The results show that the hydrophobic C₁₈ chain with intramolecular succinic anhydride linker can be attached to the hydrophilic PEG chain, an ester bond forming between the blocks. The copolymers exhibit flexible, liquid-like hydrophobic blocks even in water, which is a nonsolvent for OSA. PEG-OSA block copolymers self-organize in water, forming micellar polymer aggregates in nanoscale.     

ABA型聚L-丙氨酸-聚乙二醇嵌段共聚物的合成及其表征

利用L-α-丙氨酸和三聚光气反应制备了N-羧基-α-丙氨酸-环内酸酐(NCA).以聚乙二醇(PEG)为原料.制备了端氨基聚乙二醇(PEG-NH₂),并以此作为引发剂,引发NCA开环聚合.合成了不同组成和分子量的聚L-丙氨酸-聚乙二醇(PLAA-PEG-PLAA)嵌段共聚物.利用IR、¹H NMR、DSC、WAXD、CD等方法对共聚物结构进行了表征.结果表明,PEG-NH₂引发NCA开环聚合得到的是嵌段共聚物,通过¹H NMR谱得到共聚物组成及数均分子量;引入PEG的结果使聚L-丙氨酸的亲水性有所改善;CD测诚结果表明共聚物在水溶液中主链主要以α-螺旋构象存在.     

The Synthesis of Poly(ethylene oxide)-Block-Polybutylacrylate

ＴｈｅＳｙｎｔｈｅｓｉｓｏｆＰｏｌｙ（ｅｔｈｙｌｅｎｅｏｘｉｄｅ）┐Ｂｌｏｃｋ┐Ｐｏｌｙｂｕｔｙｌａｃｒｙｌａｔｅ＊＊ＳｕｐｐｏｒｔｅｄｂｙｔｈｅＮａｔｉｏｎａｌＮａｔｕｒａｌＳｃｉｅｎｃｅＦｏｕｎｄａｔｉｏｎｏｆＣｈｉｎａａｎｄＤｏｃｔｏｒａｌｆｏ...     

Novel synthesis of biodegradable poly(lactide-co-ethylene glycol) block copolymers

Biodegradable and amphiphilic diblock copolymers [polylactide-block-poly(ethylene glycol)] and triblock copolymers [polylactide-block-poly(ethylene glycol)-block-polylactide] were synthesized by the anionic ring-opening polymerization of lactides in the presence of poly(ethylene glycol) methyl ether or poly(ethylene glycol) and potassium hexamethyldisilazide as a catalyst. The polymerization in toluene at room temperature was very fast, yielding copolymers of controlled molecular weights and tailored molecular architectures. The chemical structure of the copolymers was investigated with ¹H and ¹³C NMR. The formation of block copolymers was confirmed by ¹³C NMR and differential scanning calorimetry investigations. The monomodal profile of the molecular weight distribution by gel permeation chromatography provided further evidence of block copolymer formation as well as the absence of cyclic species. Additional confirmation of the block copolymers was obtained by the substitution of 2-butanol for poly(ethylene glycol); butyl groups were clearly identified by ¹H NMR as polymer chain end groups. The effects of the copolymer composition and lactide stereochemistry on the copolymer properties were examined. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 2235–2245, 2007     

阴离子聚合法合成PMMA-b-PMTFPS嵌段共聚物

以含缩醛官能团的有机锂为引发剂, 将甲基丙烯酸甲酯(MMA)与含氟硅氧烷单体1,3,5-三甲基-1,3,5-三(3',3',3'-三氟丙基)环三硅氧烷(F3)阴离子嵌段共聚, 获得了窄分子量分布的聚甲基丙烯酸甲酯-b-聚[甲基(3,3,3-三氟丙基)硅氧烷](PMMA-b-PMTFPS)嵌段共聚物, 并用GPC, 1H NMR, FTIR和DSC对嵌段共聚物进行了表征. 研究结果表明, 在THF中利用PMMA-OLi对F3进行阴离子开环聚合时, 单体F3浓度的选择对提高嵌段共聚物产率至关重要.     

二维核磁共振法研究线型聚乙二醇与树枝状聚苄醚形成的三嵌段共聚物

嵌段共聚物是由几个不同的高分子链段通过化学键相连所构成的 .在合成方法上一般是通过几类不同的活性聚合 ,调控单体的加料次序或者通过不同的大分子链段末端的反应活性点偶联而成[1～ 3 ] .所形成的化学键将嵌段共聚物中不相溶的几段相连 ,于是在特定的条件下就产生了微相分离的现象 ,继而可以在 1 0～ 1 0 0nm尺度范围内形成各种各样的微区结构[4,5] .在过去的几十年里 ,研究的重点是认定嵌段共聚物的微区结构和研究微相分离的动力学 ,已发表了大量重要的结果 ,至今仍然是高分子科学中的热门课题 .非常重要的一点是 ,正是由于不同的高分…     

Application of New Modified Poly(ethylene Oxide)-Block-Poly(propylene oxide)-Block-Poly(ethylene oxide) Copolymers as Demulsifier for Petroleum Crude Oil Emulsion

Water soluble nonionic amphiphilic block copolymers based on hydrophilic poly(ethylene glycol) (PEG) and hydrophobic poly(propylene glycol) (PPG) were prepared. Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) copolymers, PEG-PPG-PEG, were prepared in the normal condition. The chemical composition and molecular weights of the prepared copolymers were determined from ¹H NMR and GPC techniques. The surface properties of the prepared surfactants were determined by measuring the surface tension at different temperatures. The prepared nonionic surfactants were evaluated as demulsifiers for water in crude-oil emulsions that were pronounced at different ratios of crude oil: water at 318 K and 333 K. The experimental results showed that the dehydration rate of the prepared demulsifiers reached 100% based on demulsifier chemical compositions and concentrations.     

Synthesis,characterization, and property of amphiphilic fluorinated abc‐type triblock copolymers

Novel amphiphilic fluorinated ABC‐type triblock copolymers composed of hydrophilic poly(ethylene oxide) monomethyl ether (MeOPEO), hydrophobic polystyrene (PSt), and hydrophobic/lipophobic poly(perfluorohexylethyl acrylate) (PFHEA) were synthesized by atom transfer radical polymerization (ATRP) using N,N,N′,N″,N″‐pentamethyldiethylenetriamine (PMDETA)/CuBr as a catalyst system. The bromide‐terminated diblock copolymers poly(ethylene oxide)‐block‐polystyrene (MeOPEO‐b‐PSt‐Br) were prepared by the ATRP of styrene initiated with the macroinitiator MeOPEO‐Br, which was obtained by the esterification of poly(ethylene oxide) monomethyl ether (MeOPEO) with 2‐bromoisobutyryl bromide. A fluorinated block of poly(perfluorohexylethyl acrylate) (PFHEA) was then introduced into the diblock copolymer by a second ATRP process to synthesize a novel ABC‐type triblock copolymer, poly(ethylene oxide)‐block‐polystyrene‐block‐poly(perfluorohexylethyl acrylate) (MeOPEO‐b‐PSt‐b‐PFHEA). These block copolymers were characterized by means of proton nuclear magnetic resonance (¹H NMR) and gel permeation chromatography (GPC). Water contact angle measurements revealed that the polymeric coating of the triblock copolymer (MeOPEO‐b‐PSt‐b‐PFHEA) shows more hydrophobic than that of the corresponding diblock copolymer (MeOPEO‐b‐PSt). Bovine serum albumin (BSA) was used as a model protein to evaluate the protein adsorption property and the triblock copolymer coating posseses excellent protein‐resistant character prior to the corresponding diblock copolymer and polydimethylsiloxane. These amphiphilic fluoropolymers can expect to have potential applications for antifouling coatings and antifouling membranes. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011